Help please!! A single force is exerted on an object in the x-direction. Shown is a graph of that force and the displacement of the object in that direction. What amount of work is done for the 30 m shown?

Why does the equilibrium position of the spring change when a mass is added to the spring? will the mass oscillate around the new equilibrium position of the spring or the previous position without a mass attached to the spring? if the equilibrium position of the spring changes by 20 cm (assuming no initial mass) when a mass is added to the spring with constant 4.9 kg/s^2, what is the mass of the object attached to the spring?